Place
the HC6 crystal in the FT-243 holder and solder the crystal leads in place.
I tried to make sure that the edges of the new crystal did not touch the
sides of the FT-243 but it did not seem to make any real difference.
But for a better shock mounting try to clear the xtal clear of the sides.
After
soldering the HC6 crystal assembly in the FT-243, run a quick "activity"check
of the crystal before continuing.
Checks good on the ole grid dip meter. 
Since
I was going to stamp on the new frequency on the inside of the FT-243 front
metal cover , I removed the rubber seal. If you are careful you can reuse
the seal. If you are not careful then make another one out of automotive
seal material or just forget the seal.
I
turned the FT-243 metal cover over, buffed with a wire brush an stamped
the new frequency using hand stamps. 
CAUTION:
Check the actual frequency
of the crystal by inserting in the equipment that you are going to use the
crystal in. Use a calibrated receiver but do not use a Japanese Rice Box.
I
love the smell of zinc
chromate in the morning. 
Ready
for assembly, on this unit we left it plain and did not paint it. 
READY
FOR DUTY. Paint em black or whatever. On the flat black crystals I filled
in the new stamped frequencies with white based paint. 
Looks good in the novice rig. 
and
on the military rig. For yet another method of FT-243 conversion using standard HC18 xtals see Page 4